Chlorine dioxide (ClO2) is most commonly used for drinking water treatment to oxidize reduced iron, manganese, sulfur compounds, and certain odor-causing organic substances in raw water. Chlorine dioxide is often used as a preoxidant because, unlike chlorine, it will not chlorinate organic compounds and, therefore, will not react with organic matter in the water to form trihalomethanes (THMs) or other byproducts.
Severn Trent Services offers the Capital Controls® Model T70G4000 and T70GD4000 chlorine dioxide generators to produce the disinfectant chemical using reagents in either commercially available or diluted concentrations. Both systems produce chlorine dioxide and consistently maintain a product yield greater than 95%, making it ideal for drinking water treatment.
As a two-chemical system, concentrations of hydrochloric acid and sodium chlorite are used to generate chlorine dioxide. The use of chlorine gas is not required when using the Severn Trent systems. The Capital Controls Model T70G4000 uses commercially available concentrations of hydrochloric acid (32%) and sodium chlorite (25%), while the Model T70GD4000 uses diluted concentrations of the chemicals of 8.5% hydrochloric acid and 7.5% sodium chlorite, fed at a 1:1 ratio.
As all-liquid systems, the Capital Controls chlorine dioxide generators ensure efficient gas production, precise solution feeding, low maintenance and dependable operation for the life of the equipment. Both models are available with either manual or automatic control in addition to system shut-down and alarm options.